[Relax][Test] Cover default GPU pipeline scheduling for R.power/elementwise kernels

[cchung100m]

Hi Commiters,

This PR adds regression coverage for GPU scheduling of legalized elementwise ops.

[gemini-code-assist]

Code Review

This pull request adds unit tests to verify that the default CUDA pipeline correctly schedules and thread-binds an elementwise R.power kernel, preventing memory verification failures during compilation. The review feedback identifies two critical issues in the newly added tests: a syntax error on line 199 where the assignment operator = is missing (mod seq(PowerModule)), and a NameError on line 202 due to using an undefined tir name instead of tvm.tirx.PrimFunc.

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